Lathe and turret mill



Jan. 30, 1945. A. L. STONE ET AL LATHE AND TURRET MILL Filed Aug. l,19.40 19 SheellS-Sl'leell l Jan. 30, 1945. A. l.. STONE ETAL LATHE ANDTURRET MILL 1'9 sheets-sheet 2 Filed Aug. l, 1940 mmm RM www .www mvMNM.

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A. L. STONE ET AL LATH'E A ND TURRET MILL Filed Aug. 1, -194O 19Sheets-Sheet 4 filo/'ngi' Jan. 30, 1945.

A. L.y STONE ETAL LATHE-AND TURRET' MILL Filed Aug. l, 1940 19Sheets-Sheet 5 Jan. 30, 1945. A. l.. sToNE'IET AL." 2,368,499

LATHE AND TIJRRET MILL Filed Aug..1, 1940` 19 sheets-sheet 7 Jan. 3o,1945.l

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1., 1940 19 Sh'eets-Shee'kl 8 '.Jan. 30, 1945. A. L. STONE Em ff2,368,499.

LATHE 'AND TURRET MILL Filed Aug. 1, 1940 19 Sheets-Sheet 9 wh/ways'.

Jan. 3o, 1945.

A. L. STONE ETAL LATI-IE AND TURRET MILL Filed Aug. 1, 1940 19sheets-sheet- 1o Jan. 30, 1945. A STONE ET AL 2,368,499

LATHE AND 'I-URRET MILL Jan. 30, 1945. A. sToNE ET Al.

LATHE AND TURRET MILL Filed Aug. l, 1940 19 SheetS-Sheetl Jan. 30, 1945.

A. L. STONE ET AL LATHE AND TURRET MILL Filed Aug. 1, 1940 19Sheets-Sheet' 14 Jan. 3o, '1945. A, L. STON E1- AL 2,368,499

LATHE AND TURRET MILL Filed Aug. l, 1940 19 Sheets--SheefI 1'5 Jan. 30,1945. A. 1 ys-roNE ET AL 2,368,499

LATHE AND TURRET MILL Filed Aug. 1, 1940 19 Sheets-Sheet 16 owl www hm.m Nw. NR.. Ev www *NM lmww Rw 2m 1m30, 1945. A. L. STONE Em 4 24,368,499

- LATHE AND TRRET MILL v 4Filed Aug. 1 1940 19 sheets-sheet- 17 Jan.-3o, 1945. -A. L. STQNE ET A@ 2,368,499

LATHE AND TURRET MILL Patented Jan.l 30, 1945 Albert L. stone, Palosverdes Los Angeles, Calif., assignors Los Angeles, Calif., a

seph H. Appleton,

to Hydril Company, corporation of Nevada Estates, and JoappueationAugust 1, 1940, serial N9. 349,130 4 (ci. ca -27) 27 Claims.

This invention relates generally to machines for performing cuttingoperations which involve relative rotation between work and cutters, andis most advantageously applied to machines wherein, during at least someportion of their cycle of operation, both the work and a cutter, such asa threading 4hob, are rotated at differential angular velocities andmoved relatively axially, whereby a thread may be milled in the work.

While this is in no way limitative, the" invention is here shown asembodied in a machine for turning and thread-milling the ends of oilwellpipe or drill stem ed joint-terminals.

In the illustrated embodiment of the invention, the machine is sodevised that during a single cycle of operations, `milling and turningcuts may be taken sequentially, alternately or in any order desired,Awhereby, with a single chucking of the work, a number of 'independent orinterdependent operations may he performedto obvious advantage, but itis to be understood that all phases of the invention are not limitedsections to provide threadv.to embodiment in a machine having such-capacity.

For instance, certain of the features may be embodied -to a machineadapted to perform only thread milling operations. But such featuresadditionally play a large part iny adapting the machine for performingintermediate or sequential turning or boring operations, wherein thecutter may vbe stationary and the work, while held against axialmovement, may be rotated at much higher speeds than those feasible forthread milling or hubbing Characteristically, the work is 'chucked in arotary spindle which has a capacity for axial movement, such movementbeing generated by relative rotation between master or copy threads onthe spindle and an engaged nut. With the rapidly rotating threading hobheld against axial movement (though in some instances it may be shiftedaxially in timed relation to the axial and angular movement of the work)and with the Work rotated in timed relation to its axial movement,v athread of given characteristics is milled in the work. The hob isprovided with great advantage in connection with annular teeth having nopitch but having the -I profile chosen. for the particular thread beingmilled, while the effective length of the hob corresponds substantiallywith the length of the desired thread. Thus, by moving the work axiallyand at a uniform speed for a distance equal to or slightly greater thanthe predetermined thread-pitch (or, if the thread is single, the threadlead) while the work is rotated at uniform speed through a singlerevolution (plus a slight angle for insuring smooth joining of thethread cuts) a complete thread of the desired vlarly to be noted thatcross-sectional coniiguration and length will be milled.

Heretofore, such axial movement oi the spindlel has been generated by'anut pemanently held against axial movement with respect to thespindle-supporting member, in some instances the nut being clampedagainst rotation while th'e spindle is threaded therethrough and inother instances both the nut and spindle being rotated, though atdiierent angular velocities. It Ifollowed that the only way the spindlecould be returned to its starting position for commencement of a newcycle, was by rotating either nut or spindle reversel'y, necessarily-arelatively slow process and, in certain types of automatic machines,calling for extremely complicated mechanisms.

'By the same token, it was not feasible to uti` lize machines soequipped, when milling operations (calling for a slowly rotating,axially moving spindle) were preceded or followed by turning operations,calling for rapid work-rotation and an axially stationary spindle. Norwas it possible to provide a plurality of sets of master threads havingdifferent pitch, from which a selected one might be chosen, for with allsets engaged the spindle would be locked against axial and rotativemovement.

All the above objectionable characteristics have been overcome and manyadditional advantages have been galned'by one phase of the inventionhere represented. This involves the use of a leader nut (matched withthey master or copy screw on the spindle) which is capable of movementaxially with respect to the spindlesupporting member. During millingoperations the nut is held against rotation and against,y axialmovement, but upon completion of that operation the nut is released soit and the spindle can be shifted bodily axially (with no screwthreadmovement involved) and return the spindle to its starting position.'I'his direct, axial shift may be accomplished rapidly and with thesimplest of mechanisms. f

Unless the particularmilling operation being considered happens to bethe last in the cycle, this shift provides a simple, eiective way toreturn the work (chucked within the spindle) to a properl startingposition forl the next operation, be it milling or turning. This is ofgreat advantage, for not only is the spindle inherently massive andheavy, but, the work is normally of considerableweight and bulk, andanything contributing to their ease and speed of handling is of definitemerit.

Of course, it is also necessary under these conditions to return the nutto or near to its starting position on the spindle, though it isparticuour arrangement has the further advantage of not requiring thenut al-

